I am trying to figure out the name of the arm that bolts onto the back of the backing plate on a front drum camaro (67). It connects to the outer tie rod and to the backing plate/spindle casting. We have one (right) but not the left. If anyone knows the name and/or where I can obtain one please let me know!!

That's called a steering arm. Beware, they come in different lengths. Manual steering used longer ones for more leverage, but slower steering. You need a matched pair. 68-74 Nova (& clones), & 67-69 Camaro/Firebird ones will fit. Go to this site & scroll down a little over halfway for info & a picture:

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